New dominance of planktonic groups in the southeastern part of the Caspian sea
Subject Areas : Animal environment
1 - Gorgan university of agricultural sciences and natural resources
Keywords: Southeast of the Caspian sea, Phytoplanktons, Zooplanktons,
Abstract :
An ongoing ecological study of the Caspian Sea, in a particular distribution, identifying the species composition and regional variations, seems to be necessary before any study. According to this, in the present study, the type of dominance of planktonic groups in southeastern basin of the Caspian Sea (Golestan Province) was studied. For this purpose, sampling of planktonic groups was done once in September 2015 with 3 repetitions. The results of phytoplankton study showed that there are 4 orders, 4 families and 4 genera in the study areas, which constitute Euglenophyta (Euglena sp. 99.9% density), Dinoflagellata (Procentrum sp. 99.5% density) and Bacillariophyta (Diatum group. 100% density), the main phytoplanktons flora of the ecosystem, respectively. The Genus Euglena is the index of hypertrophic waters and is the first time that has been seen predominantly in the studied basins. The results of zooplankton study also indicate the destruction of this planktonic group (only 1 zooplankton of the species Keratella cochlearis from the genus Rotifera was observed), which is mainly due to the toxin produced by Euglena and the anaerobic conditions in the ecosystem. In general, the results indicate a critical quality status of the studied areas, the loss of high amounts of living fauna and flora and the dominance of toxic and inappropriate planktonic groups in the ecosystem.
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